setting control-c handler

nimbus_unified/nimbus_unified.nim

@@ -5,5 +5,36 @@
 #   * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
 # at your option. This file may not be copied, modified, or distributed except according to those terms.
 
+import os
+
 when isMainModule:
-  echo "hello Nimbus"
+  echo "Starting Nimbus"
+  ## TODO
+  ## - make banner and config
+  ## - file limits
+  ## - check if we have permissions to create data folder if needed
+  ## - setup logging
+
+  ## this code snippet requires a conf.nim file (eg: beacon_lc_bridge_conf.nim)
+  #   var config = makeBannerAndConfig("Nimbus client ", NimbusConfig)
+  #   setupLogging(config.logLevel, config.logStdout, config.logFile)
+
+  ## Graceful shutdown by handling of Ctrl+C signal
+  proc controlCHandler() {.noconv.} =
+    when defined(windows):
+      # workaround for https://github.com/nim-lang/Nim/issues/4057
+      try:
+        setupForeignThreadGc()
+      except NimbusTasksError as exc:
+        raiseAssert exc.msg # shouldn't happen
+
+    echo "\nCtrl+C pressed. Shutting down working tasks"
+
+    echo "Shutting down now"
+    quit(0)
+
+  setControlCHook(controlCHandler)
+
+  while true:
+    echo "looping"
+    sleep(2000)